The 18th International Development Policy Seminar was held under the title, “Ambiguous Accountability: The In-Between World of Public-Private Partnership” on September 8, 2015. Dr. Prashant Sharma, who is the member of Open Society Fellow and Visiting Research Fellow of UNRISD led the seminar, starting by explaining what PPP (Public Private Partnership) is. He introduced the public-private partnership cases in reality, and we thought about its distinct features and problems. Public-private partnership is mostly used in large scale businesses such as infra-public services. We had discussed about the problems that occurred during last 10~20 years, as the number of cases had increased and developed. The discussion was focused particularly on accountability: Since the government and private enterprises jointly participated, which side should bear the accountability, and how the regulations should be controlled.